Adaptive frame size calculation method for multiple hop transmission of video

A multi-hop transmission and self-adaptive technology, applied in the field of transmission in wireless multi-hop networks, can solve problems affecting LT coding redundancy and network throughput, minimize transmission delay, facilitate popularization and application, and easily Achieved effect

Inactive Publication Date: 2013-04-17
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

But the frame length will affect the LT coding redundancy and also affect the network throughput

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  • Adaptive frame size calculation method for multiple hop transmission of video
  • Adaptive frame size calculation method for multiple hop transmission of video
  • Adaptive frame size calculation method for multiple hop transmission of video

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Embodiment Construction

[0020] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0021] see figure 1 , introduce the application scenario of the method of the present invention: the network using the DCF (Distributed Coordination Function) channel working mechanism of 802.11: when the sending end needs to send a frame of data, it first detects and judges whether the channel is idle, if idle, and idle If the time exceeds the DIFS (DCF InterFrame Space) of the distributed coordination function, the sender sends the data immediately; otherwise, the channel is judged to be "busy", and the sender is in a continuous listening state until the channel is free again and the idle When the time is greater than the DIFS interval, the sender does not send the data immediately, but chooses a random avoidance time, and sends the data after th...

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Abstract

The invention discloses an adaptive frame size calculation method for multiple hop transmission of video. The method comprises the following steps that (1) when sequential data of an intra coded frame (frame I) and an interframe coded frame (frame P) of the video in a cache region reaches a group of picture (GOP), a sending end begins transmitting LT coded data by an initially set frame size L, and waits for the feedback of a receiving end; (2) the receiving end counts the received data packet loss according to a computational formula for wireless transmission packet loss, and feeds an error rate value back to the sending end; and (3) the sending end comprehensively considers the influence of a frame size under the current channel quality on transmission packet loss, transmission efficiency and forward error correction coding redundancy according to the feedback error rate, and selects the optimal frame size as the data fragment length of the next transmission period. By the invention, relationships of payload data length, transmission packet loss and a channel working mechanism are comprehensively considered, the sending end and the receiving end are interactively matched, the frame size is adaptively calculated and regulated according to the feedback channel quality and the hop count of a target node, and the transmission efficiency of multiple hop transmission of video is ensured.

Description

technical field [0001] The invention relates to an adaptive frame length calculation method for video multi-hop transmission, belonging to the technical field of transmission in wireless multi-hop networks. Background technique [0002] A wireless multi-hop network is an ad hoc network composed of multiple nodes, and user data is forwarded between nodes hop by hop. The high bit error rate and high packet loss rate of this network have caused great difficulties in the transmission of large amounts of video data. Therefore, it is necessary to consider how to ensure the transmission quality and network throughput on the time-varying wireless channel. [0003] Forward Error Correction Coding FEC (Forward Error Correction) technology is to add redundant error correction codes to the transmission code. Under the set conditions, the receiving end can automatically correct the transmission errors through decoding and reduce the bit error rate of the received signal. The original vi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N21/647H04N7/26H04N7/32H04N7/64H04N19/13H04N19/50H04N19/89
Inventor 段鹏瑞马华东钱乐
Owner BEIJING UNIV OF POSTS & TELECOMM
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